The advantages/disadvantages of FF vs Crop Sensors has been discussed numerous times, and usually ends in total discord.

In different scenarios they both have their pluses and minuses, however when using UWA lens, I believe the FF sensor has a big advantage.

Look here... https://www.digicamdb.com/compare/ni...vs-nikon_d600/ for the differences in sensor size between the Nikon D7200 and D600 and here... https://www.digicamdb.com/compare/ca...os-6d-mark-ii/ for the difference between the Canon 7D MkII and the 6D MkII

As you can see, the FF sensor offers a huge advantage in sensor size, and therefore a much wider FOV (Field of View), so the same lens mounted on both cameras is going to give a much wider FOV on the FF camera.

So where does the FF camera have it's big advantage? Purely and simply in the availability of lens.

From my experience and research it would seem that 14mm is as wide as you would want to go to get reasonable control of barrel distortion.

To get the same FOV on a crop sensor camera as a 14mm lens gives on a Nikon FF camera , you would have to mount a 9.4mm lens on the crop camera, and we're getting into fish-eye territory here, and to see what that does to your image, check out some shots from the Sigma 10-20 lens @10mm, with barrel distortion right into the centre of the frame. I'm not aware of any crop sensor UWA lens that eliminates that distortion.

I'm probably opening up another 'can of worms' with this thread, but in the interests of my own learning process I welcome any comments.